Why martensite is so hard?
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Reason: Martesite contains supersaturated solid solution of C, this makes it hard by solid solution method and Martensite contains lath/plate structure of ferrite which does not allow easy dislocation motion and also it contains many dislocations formed during quenching which makes it hard.
Reason:
- Martesite contains supersaturated solid solution of C, this makes it hard by solid solution method and
- Martensite contains lath/plate structure of ferrite which does not allow easy dislocation motion and also it contains many dislocations formed during quenching which makes it hard.
See lessMartensite is so hard because in austenite phase was decomposed into martensite when there was rapid cooling and quenching. Due to rapid cooling and quenching the microstructure of austenite becomes more stronger so after rapid cooling martensite becomes so hard other than any phases in IC DIAGRAM
Martensite is so hard because in austenite phase was decomposed into martensite when there was rapid cooling and quenching. Due to rapid cooling and quenching the microstructure of austenite becomes more stronger so after rapid cooling martensite becomes so hard other than any phases in IC DIAGRAM
See lessBecause of it's bct structure?
Because of it’s bct structure?
See lessYou see the carbon trapped in the octahedral holes cause displacement of Fe atoms along c-axis of BCT in martensite. The tetragonal distortion and volume expansion cause the shear and hydrostatic stresses in lattice, which lock screw as well as edge dislocations and that's the reason behind high harRead more
You see the carbon trapped in the octahedral holes cause displacement of Fe atoms along c-axis of BCT in martensite. The tetragonal distortion and volume expansion cause the shear and hydrostatic stresses in lattice, which lock screw as well as edge dislocations and that’s the reason behind high hardness of our martensite.
See less